/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateUser.h
void DrawWindowlessDragDropContent ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > & WindowToDraw, [FSlateWindowElementList](API\Runtime\SlateCore\Rendering\FSlateWindowElementList) & WindowElementList, int32 & MaxLayerId )